EP0736496A2 - Process for conditioning industrial sludge, especially sewage sludge - Google Patents

Process for conditioning industrial sludge, especially sewage sludge Download PDF

Info

Publication number
EP0736496A2
EP0736496A2 EP96104317A EP96104317A EP0736496A2 EP 0736496 A2 EP0736496 A2 EP 0736496A2 EP 96104317 A EP96104317 A EP 96104317A EP 96104317 A EP96104317 A EP 96104317A EP 0736496 A2 EP0736496 A2 EP 0736496A2
Authority
EP
European Patent Office
Prior art keywords
products
sludge
sewage sludge
conditioning
industrial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96104317A
Other languages
German (de)
French (fr)
Other versions
EP0736496B1 (en
EP0736496A3 (en
Inventor
Jörg Dr.-Ing. Demmich
Eckard Dr.Rer.Nat. Weissflog
Gerhard Dipl.-Ing. Leininger
Winfried Schräpler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GFR Gesellschaft fuer die Aufbereitung und Verwertung von Reststoffen mbH
Original Assignee
GFR Gesellschaft fuer die Aufbereitung und Verwertung von Reststoffen mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GFR Gesellschaft fuer die Aufbereitung und Verwertung von Reststoffen mbH filed Critical GFR Gesellschaft fuer die Aufbereitung und Verwertung von Reststoffen mbH
Publication of EP0736496A2 publication Critical patent/EP0736496A2/en
Publication of EP0736496A3 publication Critical patent/EP0736496A3/en
Application granted granted Critical
Publication of EP0736496B1 publication Critical patent/EP0736496B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D3/00—Calcareous fertilisers
    • C05D3/02—Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds

Definitions

  • the present invention relates to a method for conditioning industrial and municipal sludges, in particular sewage sludge that can be used for agriculture, by adding calcium-containing products.
  • sewage sludge is produced in addition to the sand trap.
  • a wide variety of nutrients but also pollutants can be found in the sewage sludge.
  • Suitable additives can or must be used to improve drainability.
  • these can be polymeric flocculants, which have been used increasingly for several years, or on the other hand, mineral additives based on calcium, possibly combined with iron salts.
  • the lime used is usually in shape of calcium oxide or calcium hydroxide (e.g. white fine lime or white lime hydrate) processed into a suspension and added to the pre-thickened sewage sludge.
  • carbide sludge is used, for example, which is obtained in the chemical industry as a by-product in the production of acetylene as a pumpable product and can be used accordingly.
  • DE 30 03 242 discloses the addition of finely divided coals and / or ashes and DE 32 15 894 the addition of siloxane-hydrophobicized material as a drainage aid.
  • the object of the invention is to substitute the mineral raw materials containing calcium oxide or calcium hydroxide with suitable pulverulent secondary products.
  • products should be used which are to be recycled in accordance with the circular economy and in accordance with the Federal Immission Control Act in order to conserve raw material resources in this way.
  • it must be ensured that the sewage sludge is at least comparatively well dewatered and that when the sewage sludge conditioned in this way is disposed of there are no restrictions with regard to the possible uses, for example in material recycling.
  • the products should be usable for agriculture stay.
  • the product cannot be immediately used for agriculture, it can be dried after mechanical dewatering. This creates storable, spreadable products that can be used at any time.
  • the process product not only has a lime content but also a grain spectrum that is comparable to the conditioning aids used previously.
  • lime-rich by-products from desulfurization plants of industrial furnaces and power plants are therefore initially used, which are obtained dry.
  • fluidized bed ash which is known to contain a significant proportion of free lime but also fly ash, can optionally be processed with other granular residues to form mixtures which have a suitable grain spectrum and nevertheless contain less than 5% by weight of fly ash.
  • all products used are low in pollutants and that the addition of these conditioning aids does not increase the pollutant loads naturally contained in the sewage sludge so that the conditioned sludges can no longer be used or can only be used to a limited extent.
  • a dewatering aid prepared in this way has properties that are at least as good as, for example, carbide sludge or even have clear advantages over this product, for example in relation to the pressing time required for mechanical dewatering on chamber filter presses.
  • Mixing ratios of dry matter of the sewage sludge to conditioning agent of 2: 1 to 5: 1 have proven to be well suited.
  • the mixing ratio is preferably approximately 3: 1.
  • thermal drying is provided as a second process step after the mechanical dewatering, an improved detackification of the sewage sludge can be observed due to the mineral components added.
  • the drying of the sludge conditioned in this way can thus be carried out with less effort.
  • Inert residues can also be used as another granular residue, provided that they are suitable for setting a defined grain spectrum and the required chemical composition for the overall mixture.
  • Suitable granular residues are, for example, ground ash, fly ash, ground residues of building material, etc.
  • the grain size of these residues is preferably chosen so that the mixture of the conditioning agent has an overall broad grain spectrum.
  • Agricultural recycling is not only the use in agriculture for fertilization, but also the use as a soil additive or soil substrate in landscaping.
  • the process product can therefore also be used very well for recultivation.
  • process products according to the invention can also be landfilled or incinerated, provided there is not sufficient demand for this process product in agriculture or landscaping.
  • recoveries are also particularly useful if the products contain too many pollutants and / or fly ash, so that they are no longer suitable for agricultural use.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Treatment Of Sludge (AREA)
  • Treating Waste Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Fertilizers (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

To process industrial and communal sludge, and especially from sewage, byproducts rich in calcium are added from the gas cleaning systems of industrial incinerators and power stations, containing less than 5 wt. % fly ash, and with the water content removed mechanically. Further granular additives can be used, giving a grain size and distribution and chemical composition suitable for use in agriculture.

Description

Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Konditionierung von industriellen und kommunalen Schlämmen, insbesondere von Klärschlämmen, die landwirtschaftlich verwertbar sind, durch Zusatz von calciumhaltigen Produkten.The present invention relates to a method for conditioning industrial and municipal sludges, in particular sewage sludge that can be used for agriculture, by adding calcium-containing products.

Bei der Behandlung und Reinigung von kommunalen und industriellen Abwässern fällt als Abfall neben dem Sandfanggut auch Klärschlamm an. Abhängig von den jeweiligen Einleitern der Abwässer in die Kläranlage finden sich im Klärschlamm die unterschiedlichsten Nähr- aber auch Schadstoffe wieder.In the treatment and purification of municipal and industrial wastewater, sewage sludge is produced in addition to the sand trap. Depending on the respective discharges of the wastewater into the sewage treatment plant, a wide variety of nutrients but also pollutants can be found in the sewage sludge.

Dies ist die Ursache für die bei der Verwertung, z.B. in der Landwirtschaft, auftretenden Umwelt- und Akzeptanzprobleme.This is the cause of the recycling, e.g. in agriculture, emerging environmental and acceptance problems.

Aus diesem Grund werden ergänzend auch alternative Entsorgungswege, wie Kompostierung, Rekultivierung, Deponierung, Verbrennung oder Vergasung, beschritten. In den meisten Fällen ist es erforderlich, den Trockensubstanzgehalt des Klärschlamms durch mechanisches Entwässern, Zumischen geeigneter Additive oder sogar durch thermisches Trocknen zu erhöhen.For this reason, alternative disposal methods such as composting, recultivation, landfill, incineration or gasification are also used. In most cases it is necessary to increase the dry matter content of the sewage sludge by mechanical dewatering, adding suitable additives or even by thermal drying.

Bei der Entwässerung von Klärschlämmen werden kontinuierliche und diskontinuierliche Entwässerungsverfahren eingesetzt. Es ist bekannt, daß zur Verbesserung der Entwässerbarkeit geeignete Additive eingesetzt werden können bzw. müssen. Dies können einerseits polymere Flockungsmittel sein, die seit einigen Jahren verstärkt zum Einsatz kommen, oder andererseits mineralische Zusätze auf Calciumbasis gegebenenfalls kombiniert mit Eisensalzen. Dabei wird der eingesetzte Kalk meistens in Form von Calciumoxid bzw. Calciumhydroxid (z.B. Weißfeinkalk oder Weißkalkhydrat) zu einer Suspension aufbereitet und dem voreingedickten Klärschlamm zugesetzt. Weiterhin wird beispielsweise Carbidschlamm verwendet, der in der chemischen Industrie als Nebenprodukt bei der Herstellung von Acetylen als pumpfähiges Produkt anfällt und entsprechend eingesetzt werden kann.Continuous and discontinuous dewatering processes are used in the dewatering of sewage sludge. It is known that suitable additives can or must be used to improve drainability. On the one hand, these can be polymeric flocculants, which have been used increasingly for several years, or on the other hand, mineral additives based on calcium, possibly combined with iron salts. The lime used is usually in shape of calcium oxide or calcium hydroxide (e.g. white fine lime or white lime hydrate) processed into a suspension and added to the pre-thickened sewage sludge. Furthermore, carbide sludge is used, for example, which is obtained in the chemical industry as a by-product in the production of acetylene as a pumpable product and can be used accordingly.

Aus der DE 30 03 242 ist bekannt die Zugabe von feinteiligen Kohlen und/oder Aschen und aus der DE 32 15 894 die Zugabe von siloxanhydrophobiertem Material als Entwässerungshilfsmittel.DE 30 03 242 discloses the addition of finely divided coals and / or ashes and DE 32 15 894 the addition of siloxane-hydrophobicized material as a drainage aid.

Aus der DE 37 33 532 ist bekannt, einen bei der Abwasserreinigung anfallenden Klärschlamm nach der Konditionierung mit zumindest einem calciumhaltigen Abfallprodukt enthaltend Calciumsulfat und/oder Calciumsulfit, Calciumoxid und Flugasche teilweise zu entwässern und dieses Produkt als Brennstoff dem Brennaggregat einer Müllverbrennungsanlage zuzuführen, wobei gleichzeitig SO2 aus den Verbrennungsgasen entfernt wird.From DE 37 33 532 it is known to partially dewater a sewage sludge obtained in the wastewater treatment after conditioning with at least one calcium-containing waste product containing calcium sulfate and / or calcium sulfite, calcium oxide and fly ash and to feed this product as fuel to the combustion unit of a waste incineration plant, SO being simultaneously 2 is removed from the combustion gases.

Bei den dort zum Einsatz gekommenen Klärschlämmen und Wirbelschichtaschen ist nicht darauf geachtet worden, wieviel Flugasche hierin enthalten war. Das Beispiel nennt ein Produkt, welches ca. 40 Gew.-% Flugasche enthielt. Derartige Produkte sind mit Sicherheit nicht landwirtschaftlich verwertbar.In the sewage sludge and fluidized bed ash used there, no attention was paid to how much fly ash was contained therein. The example mentions a product which contained approx. 40% by weight of fly ash. Such products are certainly not usable for agriculture.

Die Erfindung hat sich die Aufgabe gestellt, die mineralischen calciumoxid- bzw. calciumhydroxidhaltigen Rohstoffe durch geeignete pulverförmige Sekundärprodukte zu substituieren. Insbesondere sollten Produkte verwendet werden, welche im Sinne der Kreislaufwirtschaft sowie gemäß Bundesimmissionsschutzgesetz zu verwerten sind, um auf diesem Weg Rohstoffressourcen zu schonen. Bei Einsatz dieser Produkte ist sicherzustellen, daß der Klärschlamm mindestens vergleichbar gut entwässert wird und daß bei der Entsorgung der solcherart konditionierten Klärschlämme keinerlei Einschränkungen bezüglich der Einsatzmöglichkeiten z.B. bei der stofflichen Verwertung auftreten. Insbesondere sollen die Produkte landwirtschaftlich verwertbar bleiben.The object of the invention is to substitute the mineral raw materials containing calcium oxide or calcium hydroxide with suitable pulverulent secondary products. In particular, products should be used which are to be recycled in accordance with the circular economy and in accordance with the Federal Immission Control Act in order to conserve raw material resources in this way. When using these products, it must be ensured that the sewage sludge is at least comparatively well dewatered and that when the sewage sludge conditioned in this way is disposed of there are no restrictions with regard to the possible uses, for example in material recycling. In particular, the products should be usable for agriculture stay.

Diese Aufgabe kann jetzt dadurch gelöst werden, daß als Konditionierungsmittel kalkreiche Nebenprodukte aus der Rauchgasreinigung von industriellen Feuerungsanlagen und Kraftwerken eingesetzt werden, welche weniger als 5 Gew.-% Flugasche enthalten, woraufhin mechanisch entwässert wird.This object can now be achieved in that lime-rich by-products from the flue gas cleaning of industrial furnaces and power plants which contain less than 5% by weight of fly ash are used as conditioning agents, whereupon mechanical dewatering is carried out.

Insbesondere, wenn das Produkt nicht unmittelbar landwirtschaftlich verwertet werden kann, kann es nach der mechanischen Entwässerung getrocknet werden. Es entstehen dann lagerfähige, streufähige und jederzeit einsetzbare Produkte.In particular, if the product cannot be immediately used for agriculture, it can be dried after mechanical dewatering. This creates storable, spreadable products that can be used at any time.

Das Verfahrensprodukt besitzt nicht nur einen Kalkanteil sondern auch ein Kornspektrum, welches mit den bisher eingesetzten Konditionierungshilfsmitteln vergleichbar ist. Zum Einsatz kommen daher erfindungsgemäß zunächst kalkreiche Nebenprodukte aus Entschwefelungsanlagen von industriellen Feuerungen und Kraftwerken, die trocken anfallen. Beim Vergleich der Analysen der bisher eingesetzten Rohstoffe mit den Analysen der verfügbaren Nebenprodukte hinsichtlich des Kalkgehalts und der Kornverteilung zeigt sich oft, daß noch durch Zumischung weiterer geeigneter Reststoffe, z.B. Wirbelschichtasche oder andere körnige Reststoffe, die gewünschten Eigenschaften eingestellt werden können. Desgleichen können Wirbelschichtaschen, die bekanntlich einen erheblichen Anteil an freiem Kalk aber auch an Flugasche enthalten, gegebenenfalls mit anderen körnigen Reststoffen zu Gemischen verarbeitet werden, die ein geeignetes Kornspektrum aufweisen und dennoch weniger als 5 Gew.-% Flugasche enthalten. Dabei ist natürlich zu beachten, daß alle eingesetzten Produkte schadstoffarm sind und daß durch die Zugabe dieser Konditionierungshilfsmittel die im Klärschlamm naturgemäß enthaltenen Schadstofffrachten nicht so erhöht werden, daß die konditionierten Schlämme nicht mehr oder nur noch eingeschränkt verwendet werden können.The process product not only has a lime content but also a grain spectrum that is comparable to the conditioning aids used previously. According to the invention, lime-rich by-products from desulfurization plants of industrial furnaces and power plants are therefore initially used, which are obtained dry. When comparing the analyzes of the raw materials used up to now with the analyzes of the available by-products with regard to the lime content and the grain distribution, it often shows that by adding other suitable residues, e.g. Fluid bed ash or other granular residues, the desired properties can be set. Likewise, fluidized bed ash, which is known to contain a significant proportion of free lime but also fly ash, can optionally be processed with other granular residues to form mixtures which have a suitable grain spectrum and nevertheless contain less than 5% by weight of fly ash. Of course, it should be noted that all products used are low in pollutants and that the addition of these conditioning aids does not increase the pollutant loads naturally contained in the sewage sludge so that the conditioned sludges can no longer be used or can only be used to a limited extent.

Überraschenderweise hat sich bei entsprechenden Konditionierungsversuchen gezeigt, daß ein solcherart aufbereitetes Entwässerungshilfsmittel mindestens gleich gute Eigenschaften wie z.B. Carbidschlamm aufweist oder sogar noch deutliche Vorteile gegenüber diesem Produkt aufweist, beispielsweise in Bezug auf die benötigte Presszeit bei der maschinellen Entwässerung auf Kammerfilterpressen. Als gut geeignet haben sich dabei Mischungsverhältnisse von Trockensubstanz des Klärschlamms zu Konditionierungsmittel von 2:1 bis 5:1 erwiesen. Vorzugsweise liegt das Mischungsverhältnis ungefähr bei 3:1.Surprisingly, with appropriate conditioning attempts shown that a dewatering aid prepared in this way has properties that are at least as good as, for example, carbide sludge or even have clear advantages over this product, for example in relation to the pressing time required for mechanical dewatering on chamber filter presses. Mixing ratios of dry matter of the sewage sludge to conditioning agent of 2: 1 to 5: 1 have proven to be well suited. The mixing ratio is preferably approximately 3: 1.

Bei der landwirtschaftlichen Ausbringung des solcherart konditionierten Klärschlammes wird neben der Hygienisierung eine zusätzliche Verbesserung der Düngeeigenschaften durch Erhöhung des CaO- und des Sulfatgehaltes (bei gleichzeitig geringer Löslichkeit und verzögerter Freisetzung) erreicht.In the agricultural application of the sewage sludge conditioned in this way, in addition to hygienization, an additional improvement in the fertilizing properties is achieved by increasing the CaO and sulfate content (with low solubility and delayed release).

Für eine zusätzliche Anhebung des Trockensubstanzgehaltes nach dem Entwässern bzw. Abpressen von Schlämmen können die genannten Nebenprodukte auch später zudosiert und mit marktüblichen Mischern eingearbeitet werden.For an additional increase in the dry matter content after dewatering or pressing sludges, the by-products mentioned can also be added later and incorporated using commercially available mixers.

Ist nach der mechanischen Entwässerung als ein zweiter Verfahrensschritt die thermische Trocknung vorgesehen, kann eine verbesserte Entklebung der Klärschlämme durch die zugegebenen mineralischen Anteile beobachtet werden. Die Trocknung des solcherart konditionierten Schlammes ist dadurch mit geringerem Aufwand durchzuführen.If thermal drying is provided as a second process step after the mechanical dewatering, an improved detackification of the sewage sludge can be observed due to the mineral components added. The drying of the sludge conditioned in this way can thus be carried out with less effort.

Als weiterer körniger Reststoff können auch inerte Reststoffe eingesetzt werden, sofern sie geeignet sind für das Gesamtgemisch ein definiertes Kornspektrum und die benötigte chemische Zusammensetzung einzustellen. Geeignete körnige Reststoffe sind beispielsweise gemahlene Aschen, Flugaschen, gemahlene Rückstände von Baumaterial etc. Die Korngröße dieser Reststoffe wird vorzugsweise so gewählt, daß das Gemisch des Konditionierungsmittel insgesamt ein möglichst breites Kornspektrum aufweist.Inert residues can also be used as another granular residue, provided that they are suitable for setting a defined grain spectrum and the required chemical composition for the overall mixture. Suitable granular residues are, for example, ground ash, fly ash, ground residues of building material, etc. The grain size of these residues is preferably chosen so that the mixture of the conditioning agent has an overall broad grain spectrum.

Als landwirtschaftliche Verwertung ist nicht nur die Nutzung in der Landwirtschaft zum Düngen zu verstehen, sondern auch die Verwendung als Bodenhilfsstoff oder Bodensubstrat im Landschaftsbau. Das Verfahrensprodukt kann somit auch sehr gut zur Rekultivierung verwendet werden.Agricultural recycling is not only the use in agriculture for fertilization, but also the use as a soil additive or soil substrate in landscaping. The process product can therefore also be used very well for recultivation.

Selbstverständlich können die erfindungsgemäßen Verfahrensprodukte auch deponiert oder verbrannt werden, sofern nicht ein ausreichender Bedarf für dieses Verfahrensprodukt in der Landwirtschaft oder im Landschaftsbau besteht. Diese Verwertungen kommen darüber hinaus insbesondere dann in Frage, wenn die Produkte zu viel Schadstoffe und/oder Flugasche enthalten, so daß sie in der landwirtschaftliche Nutzung nicht mehr geeignet sind.Of course, the process products according to the invention can also be landfilled or incinerated, provided there is not sufficient demand for this process product in agriculture or landscaping. These recoveries are also particularly useful if the products contain too many pollutants and / or fly ash, so that they are no longer suitable for agricultural use.

Claims (3)

Verfahren zur Konditionierung von industriellen und kommunalen Schlämmen, insbesondere von Klärschlämmen, die landwirtschaftlich verwertbar sind, durch Zusatz von calciumhaltigen Produkten, dadurch gekennzeichnet, daß als Konditionierungsmittel kalkreiche Nebenprodukte aus der Rauchgasreinigung von industriellen Feuerungsanlagen und Kraftwerken eingesetzt werden, welche weniger als 5 Gew.-% Flugasche enthalten, woraufhin mechanisch entwässert wird.Process for the conditioning of industrial and municipal sludges, in particular sewage sludge, which can be used for agriculture, by adding calcium-containing products, characterized in that lime-rich by-products from the flue gas cleaning of industrial furnaces and power plants are used as conditioning agents, which are less than 5% by weight. % Fly ash contained, whereupon mechanically dewatered. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß nach der mechanischen Entwässerung getrocknet wird.A method according to claim 1, characterized in that drying is carried out after the mechanical dewatering. Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kraftwerksnebenprodukte zusätzlich mit anderen körnigen Reststoffen vermischt werden, um für das Gesamtgemisch ein definiertes Kornspektrum mit einer breiteren Korngrößenverteilung zu erreichen und die für die landwirtschaftliche Verwertung gewünschte chemische Zusammensetzung einzustellen.A method according to claim 1 or 2, characterized in that the power plant by-products are additionally mixed with other granular residues in order to achieve a defined grain spectrum with a broader grain size distribution for the total mixture and to set the chemical composition desired for agricultural use.
EP96104317A 1995-04-04 1996-03-19 Process for conditioning industrial sludge, especially sewage sludge Expired - Lifetime EP0736496B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19512565 1995-04-04
DE19512565 1995-04-04

Publications (3)

Publication Number Publication Date
EP0736496A2 true EP0736496A2 (en) 1996-10-09
EP0736496A3 EP0736496A3 (en) 1998-05-13
EP0736496B1 EP0736496B1 (en) 2000-09-13

Family

ID=7758732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96104317A Expired - Lifetime EP0736496B1 (en) 1995-04-04 1996-03-19 Process for conditioning industrial sludge, especially sewage sludge

Country Status (4)

Country Link
EP (1) EP0736496B1 (en)
AT (1) ATE196285T1 (en)
CZ (1) CZ96296A3 (en)
DE (1) DE59605861D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154166A1 (en) * 1998-08-13 2001-03-16 Fernandez Juan Antonio Nunez Sludge dewatering method, by applying layer of lime, coal dust, sawdust or soil and leaving in sunlight

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3921805A1 (en) * 1988-07-05 1990-01-18 Horst Prof Dr Bannwarth Composition for fertilisation, soil improvement and protection of waterways
EP0564857A1 (en) * 1992-04-03 1993-10-13 MAYKO ENTSORGUNGSBETRIEBE GmbH Plant growth substrate with fertilising effect, in particulate free flowing form and process for the manufacture thereof
DE4304342C1 (en) * 1993-02-13 1994-10-06 Hinrich Reimers Process for the preparation of a sewage-sludge-based fertiliser

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3921805A1 (en) * 1988-07-05 1990-01-18 Horst Prof Dr Bannwarth Composition for fertilisation, soil improvement and protection of waterways
EP0564857A1 (en) * 1992-04-03 1993-10-13 MAYKO ENTSORGUNGSBETRIEBE GmbH Plant growth substrate with fertilising effect, in particulate free flowing form and process for the manufacture thereof
DE4304342C1 (en) * 1993-02-13 1994-10-06 Hinrich Reimers Process for the preparation of a sewage-sludge-based fertiliser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2154166A1 (en) * 1998-08-13 2001-03-16 Fernandez Juan Antonio Nunez Sludge dewatering method, by applying layer of lime, coal dust, sawdust or soil and leaving in sunlight

Also Published As

Publication number Publication date
DE59605861D1 (en) 2000-10-19
EP0736496B1 (en) 2000-09-13
CZ96296A3 (en) 1997-01-15
ATE196285T1 (en) 2000-09-15
EP0736496A3 (en) 1998-05-13

Similar Documents

Publication Publication Date Title
WO1992015540A1 (en) Process for separate treatment and disposal of mixtures of solid and liquid organic waste materials
DE69019643T2 (en) Process and system for the disposal of aqueous sewage sludge.
DE3725988C2 (en) Process for humidifying sewage sludge
EP0271628B1 (en) Process for the production of an upgraded product from sewage sludge
DE19641247A1 (en) Use of humic acid and its salts as catalyst or sorbent
DE10206347A1 (en) Phosphorus compound recovery from incineration residues of sludge, animal or other bio-wastes involves dissolution of the phosphates in diluted mineral acid and gives by-products useful in building materials
DE4240807C1 (en) Fertilisers based on dewatered sludge mixt. - contains sewage sludge ash and mineral fertiliser releasing nutrients according to need
EP0736496B1 (en) Process for conditioning industrial sludge, especially sewage sludge
DE4417012C2 (en) Process for the treatment of sewage sludge and use of the final product
DE19644613C2 (en) Process for the production of a fertilizer using liquid manure
KR101836823B1 (en) Method for solidifying sewage sludge using fallen leaves
AT394848B (en) METHOD FOR DISPOSAL OF A CLEANING SLUDGE RESULTING FROM WASTEWATER TREATMENT
DE10160163C2 (en) Process for conditioning sludges and / or suspensions
WO1992022512A1 (en) Process for the preparation and leach-resistant solidification of filter dusts and reaction products of flue-gas purification of waste and sewage sludge incineration plants
EP0423567A2 (en) Method for disposal of dust from waste incineration plants
DE3937312C2 (en)
DE19708907C1 (en) Processing organic material-contaminated gypsum waste
EP0209613B2 (en) Process for the environmentally acceptable disposal of wastes from coal-fired power plants
DE19644612A1 (en) Preparation of solid, pelletised fertiliser
DE4334900A1 (en) Process for treating and utilising biomasses and biogenic sludges, in particular sewage sludges
DE3619725A1 (en) Process for producing an upgraded product from sewage sludges
DE19827540B4 (en) Process for the recovery of low-calorific fractions from domestic and commercial waste treatment
AT388724B (en) Process for producing a refined product from sewage sludges
KR101018168B1 (en) Slag silicate fertilizer and manufacturing method for the same
CH677740A5 (en) Conversion of sewage and/or industrial sludge to solid prods. - by mixing with slag and/or filter dust and with metal oxide(s) and/or salts

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: SI PAYMENT 960319

RAX Requested extension states of the european patent have changed

Free format text: SI PAYMENT 960319

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: SI PAYMENT 960319

17P Request for examination filed

Effective date: 19981007

17Q First examination report despatched

Effective date: 19981118

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: SI PAYMENT 19960319

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000913

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20000913

Ref country code: GR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000913

Ref country code: GB

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000913

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000913

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000913

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 20000913

REF Corresponds to:

Ref document number: 196285

Country of ref document: AT

Date of ref document: 20000915

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59605861

Country of ref document: DE

Date of ref document: 20001019

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: GERMAN

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20001213

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20001213

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20001213

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 20000913

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010319

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010319

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010331

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010331

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010419

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
BERE Be: lapsed

Owner name: G.- FUR DIE AUFBEREITUNG UND VERWERTUNG VON RESTST

Effective date: 20010331

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050425

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061003